diff --git a/.gitignore b/.gitignore
index 12c6f2419..810f5e7aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -71,6 +71,7 @@ captures/
 .idea/deploymentTargetDropDown.xml
 .idea/deploymentTargetSelector.xml
 .idea/kotlinc.xml
+.idea/studiobot.xml
 
 # Keystore files
 *.jks
diff --git a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
index e7a50d0c3..77689fcb7 100644
--- a/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
+++ b/app/src/main/java/io/github/wulkanowy/utils/TimeExtension.kt
@@ -1,14 +1,32 @@
 package io.github.wulkanowy.utils
 
 import java.text.SimpleDateFormat
-import java.time.*
-import java.time.DayOfWeek.*
+import java.time.DayOfWeek.FRIDAY
+import java.time.DayOfWeek.MONDAY
+import java.time.DayOfWeek.SATURDAY
+import java.time.DayOfWeek.SUNDAY
+import java.time.Instant
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.Month
+import java.time.ZoneId
+import java.time.ZoneOffset
 import java.time.format.DateTimeFormatter
-import java.time.temporal.TemporalAdjusters.*
-import java.util.*
+import java.time.temporal.TemporalAdjusters.firstInMonth
+import java.time.temporal.TemporalAdjusters.next
+import java.time.temporal.TemporalAdjusters.previous
+import java.util.Locale
 
 private const val DEFAULT_DATE_PATTERN = "dd.MM.yyyy"
 
+fun getDefaultLocaleWithFallback(): Locale {
+    val locale = Locale.getDefault()
+    if (locale.language == "csb") {
+        return Locale.forLanguageTag("pl")
+    }
+    return locale
+}
+
 fun LocalDate.toTimestamp(): Long = atStartOfDay()
     .toInstant(ZoneOffset.UTC)
     .toEpochMilli()
@@ -23,7 +41,7 @@ fun String.toLocalDate(format: String = DEFAULT_DATE_PATTERN): LocalDate =
     LocalDate.parse(this, DateTimeFormatter.ofPattern(format))
 
 fun LocalDate.toFormattedString(pattern: String = DEFAULT_DATE_PATTERN): String =
-    format(DateTimeFormatter.ofPattern(pattern))
+    format(DateTimeFormatter.ofPattern(pattern, getDefaultLocaleWithFallback()))
 
 fun Instant.toFormattedString(
     pattern: String = DEFAULT_DATE_PATTERN,
@@ -31,7 +49,7 @@ fun Instant.toFormattedString(
 ): String = atZone(tz).format(DateTimeFormatter.ofPattern(pattern))
 
 fun Month.getFormattedName(): String {
-    val formatter = SimpleDateFormat("LLLL", Locale.getDefault())
+    val formatter = SimpleDateFormat("LLLL", getDefaultLocaleWithFallback())
 
     val date = LocalDateTime.now().withMonth(value)
     return formatter.format(date.toInstant(ZoneOffset.UTC).toEpochMilli()).capitalise()
@@ -76,7 +94,7 @@ inline val LocalDate.previousOrSameSchoolDay: LocalDate
     }
 
 inline val LocalDate.weekDayName: String
-    get() = format(DateTimeFormatter.ofPattern("EEEE", Locale.getDefault()))
+    get() = format(DateTimeFormatter.ofPattern("EEEE", getDefaultLocaleWithFallback()))
 
 inline val LocalDate.monday: LocalDate get() = with(MONDAY)
 
diff --git a/app/src/main/res/values-cs/preferences_values.xml b/app/src/main/res/values-cs/preferences_values.xml
index c9b2258fc..fa5bad545 100644
--- a/app/src/main/res/values-cs/preferences_values.xml
+++ b/app/src/main/res/values-cs/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 minut</item>
diff --git a/app/src/main/res/values-csb-rPL/preferences_values.xml b/app/src/main/res/values-csb-rPL/preferences_values.xml
index 8b4be0d9b..902014177 100644
--- a/app/src/main/res/values-csb-rPL/preferences_values.xml
+++ b/app/src/main/res/values-csb-rPL/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 minutów</item>
diff --git a/app/src/main/res/values-de/preferences_values.xml b/app/src/main/res/values-de/preferences_values.xml
index 23828b030..a6d698416 100644
--- a/app/src/main/res/values-de/preferences_values.xml
+++ b/app/src/main/res/values-de/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 Minuten</item>
diff --git a/app/src/main/res/values-pl/preferences_values.xml b/app/src/main/res/values-pl/preferences_values.xml
index 8eafa1cb4..ae7d0ac84 100644
--- a/app/src/main/res/values-pl/preferences_values.xml
+++ b/app/src/main/res/values-pl/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 minut</item>
diff --git a/app/src/main/res/values-ru/preferences_values.xml b/app/src/main/res/values-ru/preferences_values.xml
index 63ab4fc44..095a2a975 100644
--- a/app/src/main/res/values-ru/preferences_values.xml
+++ b/app/src/main/res/values-ru/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 минут</item>
diff --git a/app/src/main/res/values-sk/preferences_values.xml b/app/src/main/res/values-sk/preferences_values.xml
index b06f2b3fa..af34eebcc 100644
--- a/app/src/main/res/values-sk/preferences_values.xml
+++ b/app/src/main/res/values-sk/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 minút</item>
diff --git a/app/src/main/res/values-uk/preferences_values.xml b/app/src/main/res/values-uk/preferences_values.xml
index 72abe1f70..4b090f095 100644
--- a/app/src/main/res/values-uk/preferences_values.xml
+++ b/app/src/main/res/values-uk/preferences_values.xml
@@ -19,6 +19,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="services_interval_entries">
         <item>15 хвилин</item>
diff --git a/app/src/main/res/values/preferences_values.xml b/app/src/main/res/values/preferences_values.xml
index e5020b533..fc9a4eeb4 100644
--- a/app/src/main/res/values/preferences_values.xml
+++ b/app/src/main/res/values/preferences_values.xml
@@ -40,6 +40,7 @@
         <item>Deutsch</item>
         <item>Čeština</item>
         <item>Slovenčina</item>
+        <item>Kaszëbsczi</item>
     </string-array>
     <string-array name="app_language_values" translatable="false">
         <item>system</item>
@@ -50,6 +51,7 @@
         <item>de</item>
         <item>cs</item>
         <item>sk</item>
+        <item>csb</item>
     </string-array>
 
     <string-array name="services_interval_entries">